My 2010 avy DRL won't come on however the headlights do come on when it statrs to get dark so the sensor is working. These are brand new brand name DRL bulbs so I know they're not the problem plus the chance of both going out at the same time is unlikely. I checked the under hood fuses 31 and 33 both good. What else can I check?

 

I'm not 100% about this but don't they only come on when the vehicle is in drive? If the headlights are coming on when it's starting to get dark then the dash sensor is working.

 

The smaller daytime running lights underneath the main heaglight don't come on at all. I parked in front of a store with reflective window so I can see if the light came on when truck is in drive but no DRLs.

 

Check the DRL relay.

 

I went to look for the DRL relay under the hood in the fuse box but there is no DRL relay there according to the layout. Where else would it be?

 

Im in the process of upgrading my headlights to aftermarket on my 04 Silverado. In the process I noticed that my daytime driving lights do not come on. Replaced the bulbs. Looks as if the receptacles were blackened a little, but only one bulb looked burned out. Lights still dont come on. Looking for answers to the same situation..

 

dont know if this will help anyone but just in case. replaced my bulbs for both daytime driving lights. lights still didnt work. opened fuse case under hood, cked fuse, looked ok, put it back, didnt work, tapped around on fuse and large grey box fuse, cked lights, both were on. go figuire. 04 chevy silverado

 

I think the parking brake has to also be off...